There is mounting speculation the Government is set to back a third runway in the coming weeks, ending years of rowing about airport expansion.
Mr Goldsmith, the MP for Richmond, has been one of the leading figures against Heathrow expansion.
The former London mayoral candidate confirmed that he would stand down if Heathrow expansion was approved - but said the project faced "huge question marks" around its delivery.
Speaking on the Today programme on BBC Radio 4, Mr Goldsmith said: "My position is the same as it was nine years ago.
"I promised my constituents before I... read more

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